Method of allocating radio resources in a wireless communication system

ABSTRACT

A method of allocating radio resources in a wireless communication system is disclosed. A method of allocating radio resources from a network of a wireless communication system in accordance with a plurality of scheduling modes comprises transmitting first scheduling information to a user equipment to allocate radio resources to the user equipment in accordance with a first scheduling mode, the first scheduling information including a first user equipment identifier, and transmitting second scheduling information to the user equipment to allocate radio resources to the user equipment in accordance with a second scheduling mode, the second scheduling information including a second user equipment identifier.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a 371 U.S. national stage application continuationreissue application of U.S. Reissue application Ser. No. 13/850,979,filed on Mar. 26, 2013, now U.S. Pat. No. Re. 44,767, which is acontinuation reissue application of U.S. Reissue application Ser. No.13/371,329, filed on Feb. 10, 2012, now U.S. Pat. No. Re. 44,203, whichis a reissue application of U.S. Pat. No. 7,996,029 B2, issued from U.S.patent application Ser. No. 12/667,380 filed on Apr. 20, 2010, which isthe National Stage filing under 35 U.S.C. 371 of internationalapplication No. PCT/KR2008/004915, filed on Aug. 22, 2008, which claimspriority to the benefit of U.S. provisional applications applicationNos. 60/957,450, filed on Aug. 22, 2007, 60/976,766, filed on Oct. 1,2007, 60/977,366, filed on Oct. 3, 2007, 61/018,884, filed on Jan. 3,2008, 61/038,470, filed on Mar. 21, 2008, 61/039,095, filed on Mar. 24,2008, and 61/074,998, filed on Jun. 23, 2008, and also claims thebenefit of earlier filing date and right of priority to Korean patentapplication No. 10-2008-0082245, filed on Aug. 22, 2008, the contents ofwhich are all hereby incorporated by reference herein in their entirety.

TECHNICAL FIELD

The present invention relates to a wireless communication system, andmore particularly, to a method of allocating radio resources in awireless communication system.

BACKGROUND ART

In a wireless communication system which uses multiple carriers, such asan orthogonal frequency division multiple access (OFDMA) or a singlecarrier-frequency division multiple access (SC-FDMA), radio resourcesare a set of continuous sub-carriers and are defined by a time-frequencyregion on a two-dimensional sphere. A time-frequency region is arectangular form sectioned by time and sub-carrier coordinates. In otherwords, one time-frequency region could be a rectangular form sectionedby at least one symbol on a time axis and a plurality of sub-carriers ona frequency axis. Such a time-frequency region can be allocated to anuplink for a specific user equipment (UE), or an eNode B can transmitthe time-frequency region to a specific user equipment in a downlink. Inorder to define such a time-frequency region on the two-dimensionalsphere, the number of OFDM symbols and the number of continuoussub-carriers starting from a point having an offset from a referencepoint should be given.

An evolved universal mobile telecommunications system (E-UMTS) which iscurrently being discussed uses 10 ms radio frame comprising 10sub-frames. Namely, one sub-frame includes two continuous slots. Oneslot has a length of 0.5 ms. Also, one sub-frame comprises a pluralityof OFDM symbols, and a part (for example, first symbol) of the pluralityof OFDM symbols can be used for transmission of L1/L2 controlinformation.

FIG. 1 illustrates an example of a structure of physical channels usedin the E-UMTS. In FIG. 1, one sub-frame comprises an L1/L2 controlinformation transmission region (hatching part) and a data transmissionregion (non-hatching part).

FIG. 2 illustrates a general method of transmitting data in the E-UMTS.In the E-UMTS, a hybrid auto repeat request (HARQ) scheme, which is oneof data retransmission schemes, is used to improve throughput, therebyenabling desirable communication.

Referring to FIG. 2, the eNB transmits downlink scheduling information(hereinafter, referred to as ‘DL scheduling information’) through DLL1/L2 control channel, for example, a physical downlink control channel(PDCCH), to transmit data to a user equipment in accordance with theHARQ scheme. The DL scheduling information includes user equipmentidentifier (UE ID) or group identifier (group ID) of user equipments,location and duration (resource assignment and duration of assignment)information of radio resources allocated for transmission of downlinkdata, modulation mode, payload size, transmission parameters such asMIMO related information, HARQ process information, redundancy version,and new data indicator.

In order to notify that DL scheduling information is transmitted throughthe PDCCH for what user equipment, the user equipment identifier (orgroup identifier), for example, a radio network temporary identifier(RNTI) is transmitted. The RNTI can be classified into a dedicated RNTIand a common RNTI. The dedicated RNTI is used for data transmission andreception to and from a user equipment of which information isregistered with a eNB. The common RNTI is used if communication isperformed with user equipments, which are not allocated with dedicatedRNTI as their information is not registered with the eNB. Alternatively,the common RNTI is used for transmission and reception of informationused commonly for a plurality of user equipments, such as systeminformation. For example, examples of the common RNTI include RA-RNTIand T-C-RNTI, which are used during a random access procedure through arandom access channel (RACH). The user equipment identifier or groupidentifier can be transmitted in a type of CRC masking in DL schedulinginformation transmitted through the PDCCH.

User equipments located in a specific cell monitor the PDCCH through theL1/L2 control channel using their RNTI information, and receive DLscheduling information through the corresponding PDCCH if theysuccessfully perform CRC decoding through their RNTI. The userequipments receive downlink data transmitted thereto through a physicaldownlink shared channel (PDSCH) indicated by the received DL schedulinginformation.

A scheduling mode can be classified into a dynamic scheduling mode and apersistent or semi-persistent scheduling mode. The dynamic schedulingmode is to transmit scheduling information to a specific user equipmentthrough the PDCCH whenever allocation of uplink or downlink resources isrequired for the specific user equipment. The persistent scheduling modemeans that the eNB allocates downlink or uplink scheduling informationto the user equipment statically during initial call establishment suchas establishment of a radio bearer.

In case of the persistent scheduling mode, the user equipment transmitsor receives data using scheduling information previously allocated tothe eNB without using DL scheduling information or UL schedulinginformation allocated from the eNB. For example, if the eNB previouslysets a specific user equipment to allow the user equipment to receivedownlink data through RRC signal and a radio resource “A” in accordancewith a transport format “B” and a period “C” during establishment of aradio bearer, the user equipment can receive downlink data transmittedfrom the eNB using information “A”, “B” and “C”. Likewise, even in casethat the user equipment transmits data to the eNB, the user equipmentcan transmit uplink data using a previously defined radio resource inaccordance with previously allocated uplink scheduling information. Thepersistent scheduling mode is a scheduling mode that can well be appliedto a service of which traffic is regular, such as voice communication.

AMR codec used in voice communication, i.e., voice data generatedthrough voice codec has a special feature. Namely, voice data areclassified into a talk spurt and a silent period. The talk spurt means avoice data period generated while a person is actually talking, and thesilent period means a voice data period generated while a person doesnot talk. For example, voice packets, which include voice data in thetalk spurt, are generated per 20 ms, and silent packets (SID), whichinclude voice data in the silent period, are generated per 160 ms.

If the persistent scheduling mode is used for voice communication, theeNB will establish radio resources in accordance with the talk spurt.Namely, the eNB will previously establish radio resources fortransmitting and receiving uplink or downlink data to and from the userequipment at an interval of 20 ms during call establishment using afeature that voice packets are generated per 20 ms. The user equipmentreceives downlink data or transmits uplink data using radio resources,which are previously established per 20 ms.

DISCLOSURE OF THE INVENTION

In the wireless communication system, communication can be performed insuch a manner that the dynamic scheduling mode and the persistentscheduling mode are simultaneously applied to one user equipment. Forexample, if voice communication according to a VoIP service is performedin accordance with an HARQ scheme, the persistent scheduling mode isapplied to initial transmission packets, and the dynamic scheduling modeis applied to retransmission packets. Also, if the user equipmentsimultaneously uses two or more services, the persistent scheduling modecan be applied to one service and the dynamic scheduling mode can beapplied to the other service. In these cases, it is required that theuser equipment should definitely identify whether scheduling informationtransmitted thereto depends on what scheduling mode, or whether thescheduling information is for initial transmission packets orretransmission packets, or whether the scheduling information is forwhat service.

Accordingly, the present invention is directed to a method of allocatingradio resources in a wireless communication system, which substantiallyobviates one or more problems due to limitations and disadvantages ofthe related art.

An object of the present invention is to provide a method of allocatingradio resources in a wireless communication system, in which radioresources can efficiently be used in the wireless communication system.

Another object of the present invention is to provide a method ofallocating radio resources in a wireless communication system, in whicha user equipment can definitely identify scheduling informationaccording to each scheduling mode in a wireless communication systemwhich allocates radio resources in accordance with a plurality ofscheduling modes.

In one aspect of the present invention, a network of a wirelesscommunication system transmits first scheduling information to a userequipment to allocate radio resources to the user equipment inaccordance with a first scheduling mode, the first schedulinginformation including a first user equipment identifier, and transmitssecond scheduling information to the user equipment to allocate radioresources to the user equipment in accordance with a second schedulingmode, the second scheduling information including a second userequipment identifier.

In another aspect of the present invention, when a user equipmentreceives scheduling information including a user equipment identifierfrom a network, the user equipment transmits uplink data or receivesdownlink data using radio resources allocated in accordance with a firstscheduling mode. When a second user equipment identifier is included inthe scheduling information, the user equipment transmits uplink data orreceives downlink data using radio resources allocated in accordancewith a second scheduling mode.

According to the present invention, the wireless communication systemcan efficiently use radio resources. Also, in the wireless communicationsystem which allocates radio resources in accordance with a plurality ofscheduling modes, a user equipment can definitely identify schedulinginformation according to each scheduling mode.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a structure of a physicalchannel used in an E-UMTS (Evolved-Universal Mobile TelecommunicationsSystem);

FIG. 2 is a diagram illustrating a general method of transmitting datain an E-UMTS;

FIG. 3 is a diagram illustrating a network structure of an E-UMTS;

FIG. 4 is a schematic view illustrating an E-UTRAN (Evolved UniversalTerrestrial Radio Access Network);

FIG. 5A and FIG. 5B are diagrams illustrating a structure of a radiointerface protocol between a user equipment (UE) and E-UTRAN, in whichFIG. 5A is a schematic view of a control plane protocol and FIG. 5B is aschematic view of a user plane protocol; and

FIG. 6 is a flow chart illustrating a procedure of a method oftransmitting data in accordance with one embodiment of the presentinvention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, structures, operations, and other features of the presentinvention will be understood readily by the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. Embodiments described later are examples in which technicalfeatures of the present invention are applied to an E-UMTS (EvolvedUniversal Mobile Telecommunications System).

FIG. 3 illustrates a network structure of an E-UMTS. An E-UMTS is asystem evolving from the conventional WCDMA UMTS and its basicstandardization is currently handled by the 3GPP (3^(rd) GenerationPartnership Project). The E-UMTS can also be called an LTE (Long TermEvolution) system.

Referring to FIG. 3, an E-UTRAN includes eNode Bs (hereinafter, referredto as ‘eNode B’ or ‘eNB’), wherein respective eNBs are connected witheach other through X2 interface. Also, each of eNBs is connected with auser equipment (UE) through a radio interface and connected with EPC(Evolved Packet Core) through S1 interface. The EPC includes a mobilitymanagement entity/system architecture evolution (MME/SAE) gateway.

Layers of a radio interface protocol between a UE and a network can beclassified into a first layer L1, a second layer L2 and a third layer L3based on three lower layers of OSI (open system interconnection)standard model widely known in communication systems. A physical layerbelonging to the first layer L1 provides an information transfer serviceusing a physical channel. A radio resource control (hereinafter,abbreviated as ‘RRC’) located at the third layer plays a role incontrolling radio resources between the UE and the network. For this,the RRC layer enables RRC messages to be exchanged between the UE andthe network. The RRC layer can be distributively located at networknodes including Node B, an AG and the like or can be independentlylocated at either the Node B or the AG.

FIG. 4 is a schematic view illustrating an E-UTRAN (UMTS terrestrialradio access network). In FIG. 4, a hatching part represents functionalentities of a user plane, and a non-hatching part represents functionalentities of a control plane.

FIG. 5A and FIG. 5B illustrate a structure of a radio interface protocolbetween the UE and the E-UTRAN, in which FIG. 5A is a schematic view ofa control plane protocol and FIG. 5B is a schematic view of a user planeprotocol. Referring to FIG. 5A and FIG. 5B, a radio interface protocolhorizontally includes a physical layer, a data link layer, and a networklayer, and vertically includes a user plane for data informationtransfer and a control plane for signaling transfer. The protocol layersin FIG. 5A and FIG. 5B can be classified into L1 (first layer), L2(second layer), and L3 (third layer) based on three lower layers of theopen system interconnection (OSI) standard model widely known in thecommunications systems.

The physical layer as the first layer provides an information transferservice to an upper layer using physical channels. The physical layer(PHY) is connected to a medium access control (hereinafter, abbreviatedas ‘MAC’) layer above the physical layer via transport channels. Dataare transferred between the medium access control layer and the physicallayer via the transport channels. Moreover, data are transferred betweendifferent physical layers, and more particularly, between one physicallayer of a transmitting side and the other physical layer of a receivingside via the physical channels. The physical channel of the E-UMTS ismodulated in accordance with an orthogonal frequency divisionmultiplexing (OFDM) scheme, and time and frequency are used as radioresources.

The medium access control (hereinafter, abbreviated as ‘MAC’) layer ofthe second layer provides a service to a radio link control(hereinafter, abbreviated as ‘RLC’) layer above the MAC layer vialogical channels. The RLC layer of the second layer supports reliabledata transfer. In order to effectively transmit data using IP packets(e.g., IPv4 or IPv6) within a radio-communication period having a narrowbandwidth, a PDCP layer of the second layer (L2) performs headercompression to reduce the size of unnecessary control information.

A radio resource control (hereinafter, abbreviated as ‘RRC’) layerlocated on a lowest part of the third layer is defined in the controlplane only and is associated with configuration, reconfiguration andrelease of radio bearers (hereinafter, abbreviated as ‘RB s’) to be incharge of controlling the logical, transport and physical channels. Inthis case, the RB means a service provided by the second layer for thedata transfer between the UE and the UTRAN.

As downlink transport channels carrying data from the network to theUEs, there are provided a broadcast channel (BCH) carrying systeminformation, a paging channel (PCH) carrying paging message, and adownlink shared channel (SCH) carrying user traffic or control messages.The traffic or control messages of a downlink multicast or broadcastservice can be transmitted via the downlink SCH or an additionaldownlink multicast channel (MCH). Meanwhile, as uplink transportchannels carrying data from the UEs to the network, there are provided arandom access channel (RACH) carrying an initial control message and anuplink shared channel (ULSCH) carrying user traffic or control message.

As logical channels located above the transport channels and mapped withthe transport channels, there are provided a broadcast control channel(BCCH), a paging control channel (PCCH), a common control channel(CCCH), a multicast control channel (MCCH), and a multicast trafficchannel (MTCH).

In the E-UMTS system, an OFDM is used on the downlink and a singlecarrier frequency division multiple access (SCFDMA) on the uplink. TheOFDM scheme using multiple carriers allocates resources by unit ofmultiple sub-carriers including a group of carriers and utilizes anorthogonal frequency division multiple access (OFDMA) as an accessscheme.

FIG. 6 is a flow chart illustrating a procedure of a method oftransmitting data in accordance with one embodiment of the presentinvention. According to the embodiment of FIG. 6, the user equipment(UE) receives SRB packets in accordance with a dynamic scheduling modewhile receiving voice data (VoIP packets) in accordance with apersistent scheduling mode. Hereinafter, description will be made onlyif necessary for understanding of the embodiment of the presentinvention, and description of a general procedure required forcommunication between a network and a UE will be omitted.

Referring to FIG. 6, the eNode-B (eNB) allocates two UE identifiers tothe UE [S61]. Examples of the two UE identifiers include a C-RNTI and anSPS-C-RNTI (Semi-Persistent Scheduling RNTI). However, the two UEidentifiers will not be limited to the above examples. For example,temporary C-RNTI and RA-RNTI may be used as the two UE identifiers. Thetwo UE identifiers can be allocated to the UE by the network duringrandom access procedure, call establishment procedure, or radio bearer(RB) establishment procedure, etc. Also, the two UE identifiers may beallocated simultaneously or individually.

The eNB transmits first scheduling information to the UE to allocateradio resources for transmission and reception of voice data [S62]. Thefirst scheduling information can include uplink scheduling informationand downlink scheduling information. The first scheduling informationincludes the SPS-C-RNTI to indicate that the scheduling information isallocated in accordance with the persistent scheduling mode. TheSPS-C-RNTI can be included in the first scheduling information in a typeof CRC (Cyclic Redundancy Check) masking in at least part of the firstscheduling information. The first scheduling information is set to havea format (first format) different from that of scheduling informationaccording to the dynamic scheduling mode. The UE decodes the firstscheduling information in accordance with the first format, and if theSPS-C-RNTI is included in the first scheduling information, the UErecognizes that the first scheduling information is schedulinginformation according to the persistent scheduling mode. The firstscheduling information includes information associated with a locationof radio resources allocated to the UE, an allocation period, and anallocation interval, etc. The UE transmits uplink data or receivesdownlink data using the radio resources allocated at an allocationperiod for an allocation interval in accordance with the firstscheduling information.

The eNB transmits an initial transmission VoIP packet V1 to the UE onthe PDSCH in accordance with the first scheduling information [S63]. Theinitial transmission VoIP packet V1 means a voice packet which is not aretransmission packet, when the HARQ scheme is used. If the UE fails tosuccessfully receive the initial transmission VoIP packet V1, i.e., ifthe UE fails to decode the initial transmission VoIP packet V1, the UEtransmits NACK to the eNB on a physical uplink control channel (PUCCH)[S64]. The UE receives the initial transmission VoIP packet V1 ortransmits NACK (or ACK) using the first scheduling information.

When the UE receives the initial transmission VoIP packet V1 ortransmits NACK (or ACK), the persistent scheduling mode is used.However, the dynamic scheduling mode is used for transmission of aretransmission VoIP packet by the eNB. Accordingly, after transmittingthe NACK to the eNB, the UE should first receive scheduling informationto receive the retransmission packet. To this end, the UE monitors thePDCCH of the L1/L2 control channel.

In FIG. 6, the eNB transmits second scheduling information to the UE onthe PDCCH [S65]. The second scheduling information is to allocate uplinkand downlink channel resources in accordance with the dynamic schedulingmode, and can include downlink (DL) scheduling information and uplink(UL) scheduling information. The second scheduling information includesthe C-RNTI to indicate that the second scheduling information isallocated in accordance with the dynamic scheduling mode. The C-RNTI canbe included in the second scheduling information in a type of CRC(CyclicRedundancy Check) masking in at least part of the second schedulinginformation. The second scheduling information is set to have a format(second format) different from that of the scheduling informationaccording to the persistent scheduling mode, i.e., the first schedulinginformation. The UE decodes the second scheduling information inaccordance with the second format, and if the C-RNTI is included in thesecond scheduling information, the UE recognizes that the secondscheduling information is scheduling information according to thedynamic scheduling mode. The second scheduling information includes aHARQ process identifier.

The eNB transmits an initial transmission SRB packet S1 to the UE inaccordance with the second scheduling information [S66]. The initialtransmission SRB packet S1 means SRB packet which is not aretransmission packet, when the HARQ scheme is used. If the UE fails tosuccessfully receive the initial transmission SRB packet S1, i.e., ifthe UE fails to decode the initial transmission SRB packet S1, the UEtransmits NACK to the eNB on the PUCCH [S67]. The UE receives theinitial transmission SRB packet S1 or transmits the NACK (or ACK) usingthe second scheduling information.

The eNB transmits third scheduling information to the UE on PDCCH totransmit a retransmission packet V2 for the initial transmission VoIPpacket V1, wherein the third scheduling information includes theSPS-C-RNTI [S68]. If the UE receives the third scheduling informationwhich includes the SPS-C-RNTI, the UE receives the retransmission VoIPpacket V2, which is transmitted from the eNB, using the third schedulinginformation [S69]. The UE combines the received retransmission VoIPpacket V2 with the initial transmission VoIP packet V1 in accordancewith the HARQ scheme to recover a VoIP packet [S70]. If the UEsuccessfully recovers the VoIP packet, the UE transmits ACK to the eNB[S71]. The VoIP packet means a data packet intended to be transmittedfrom the eNB to the UE. The VoIP packet is divided into the initialtransmission VoIP packet V1 and the retransmission VoIP packet V2 basedon the VoIP packet and then transmitted to the UE in accordance with theHARQ scheme.

The third scheduling information can include information related to atransmission timing point when the eNB transmits the initialtransmission VoIP packet V1. For example, the third schedulinginformation can include information indicating a transport time interval(TTI) where the initial transmission VoIP packet V1 is transmitted. TheUE can easily recognize that the retransmission VoIP packet V2 is aretransmission packet for the initial transmission VoIP packet, inaccordance with the information related to the timing point when the eNBtransmits the initial transmission VoIP packet V1 included in the thirdscheduling information.

The eNB transmits fourth scheduling information to the UE on PDCCH totransmit a retransmission packet S2 for the initial transmission SRBpacket S1, wherein the fourth scheduling information includes the C-RNTI[S72]. If the UE receives the fourth scheduling information whichincludes the C-RNTI, the UE receives the retransmission SRB packet S2,which is transmitted from the eNB, using the fourth schedulinginformation [S73]. The UE combines the received retransmission SRBpacket S2 with the initial transmission SRB packet S1 in accordance withthe HARQ scheme to recover an SRB packet [S74]. If the UE successfullyrecovers the SRB packet, the UE transmits ACK to the eNB [S75]. The SRBpacket means a data packet intended to be transmitted from the eNB tothe UE. The SRB packet is divided into the initial transmission SRBpacket S1 and the retransmission SRB packet S2 based on the SRB packetand then transmitted to the UE in accordance with the HARQ scheme. Thefourth scheduling information includes the same HARQ process identifieras that included in the second scheduling information.

In the embodiment of FIG. 6, the first scheduling information to thefourth scheduling information can further include identificationinformation that can identify whether the data packet transmitted fromthe eNB to the UE in accordance with the first scheduling information tothe fourth scheduling information is the initial transmission packet orthe retransmission packet. The identification information can beincluded in the first scheduling information to the fourth schedulinginformation in such a manner that a specific field of the firstscheduling information to the fourth scheduling information is set to avalue which is a previously determined. For example, a firstretransmission packet, a second retransmission packet, and a thirdretransmission packet can be identified in such a manner that specificvalues such as 1, 2 and 3 are set in a redundancy version (RV) fieldincluded in the first scheduling information to the fourth schedulinginformation. In addition to the RV field, other field included in thefirst scheduling information to the fourth scheduling information, forexample, at least one of HARQ process ID field, format field, MCS field,NDI (New data indicator) field, TPC field, “Cyclic shift for DMRS”field, “TX antenna” field, and CQI request field is set to a specificvalue, whereby the set value can be used as the identificationinformation.

The aforementioned embodiments are achieved by combination of structuralelements and features of the present invention in a predetermined type.Each of the structural elements or features should be consideredselectively unless specified separately. Each of the structural elementsor features may be carried out without being combined with otherstructural elements or features. Also, some structural elements and/orfeatures may be combined with one another to constitute the embodimentsof the present invention. The order of operations described in theembodiments of the present invention may be changed. Some structuralelements or features of one embodiment may be included in anotherembodiment, or may be replaced with corresponding structural elements orfeatures of another embodiment. Moreover, it will be apparent that someclaims referring to specific claims may be combined with another claimsreferring to the other claims other than the specific claims toconstitute the embodiment or add new claims by means of amendment afterthe application is filed.

The embodiments of the present invention have been described based ondata transmission and reception between an eNB and a UE. A specificoperation which has been described as being performed by the eNB may beperformed by an upper node of the eNB as the case may be. In otherwords, it will be apparent that various operations performed forcommunication with the UE in the network which includes a plurality ofnetwork nodes along with the cNB may be performed by the eNB or networknodes other than the eNB. The eNB may be replaced with terms such as afixed station, base station, Node B, eNode B, and access point. Also,the UE may be replaced with terms such as mobile station (MS) and mobilesubscriber station (MSS).

The embodiments according to the present invention may be implemented byvarious means, for example, hardware, firmware, software, or theircombination. If the embodiment according to the present invention isimplemented by hardware, the embodiment of the present invention may beimplemented by one or more application specific integrated circuits(ASICs), digital signal processors (DSPs), digital signal processingdevices (DSPDs), programmable logic devices (PLDs), field programmablegate arrays (FPGAs), processors, controllers, microcontrollers,microprocessors, etc.

If the embodiment according to the present invention is implemented byfirmware or software, the method of transmitting and receiving data inthe wireless communication system according to the embodiment of thepresent invention may be implemented by a type of a module, a procedure,or a function, which performs functions or operations described asabove. A software code may be stored in a memory unit and then may bedriven by a processor. The memory unit may be located inside or outsidethe processor to transmit and receive data to and from the processorthrough various means which are well known.

It will be apparent to those skilled in the art that the presentinvention can be embodied in other specific forms without departing fromthe spirit and essential characteristics of the invention. Thus, theabove embodiments are to be considered in all respects as illustrativeand not restrictive. The scope of the invention should be determined byreasonable interpretation of the appended claims and all change whichcomes within the equivalent scope of the invention are included in thescope of the invention.

INDUSTRIAL APPLICABILITY

The present invention can be used in a wireless communication systemsuch as a mobile communication system or a wireless Internet system.

The invention claimed is:
 1. A method of radio resources allocation at auser equipment of a wireless communication system, the methodcomprising: receiving scheduling information from a network, wherein thescheduling information comprises either a radio network temporaryidentifier (C-RNTI) to indicate that the scheduling information isassociated with a dynamic scheduling mode or a Semi-PersistentScheduling RNTI (SPS-C-RNTI) to indicate that the scheduling informationis associated with a semi-persistent scheduling mode; if the schedulinginformation comprises the C-RNTI, receiving downlink data using thescheduling information during a corresponding transmission intervalonly; and if the scheduling information comprises the SPS-C-RNTI,receiving the downlink data using the scheduling informationperiodically according to an allocation period included in thescheduling information.
 2. The method of claim 1, wherein the C-RNTI andthe SPS-C-RNTI are allocated from the network before receiving thescheduling information.
 3. The method of claim 1, wherein the schedulinginformation is received on a physical downlink control channel (PDCCH).4. A method of radio resources allocation at a user equipment of awireless communication system, the method comprising: receivingscheduling information from a network, wherein the schedulinginformation comprises either a radio network temporary identifier(C-RNTI) to indicate that the scheduling information is associated witha dynamic scheduling mode or a Semi-Persistent Scheduling RNTI(SPS-C-RNTI) to indicate that the scheduling information is associatedwith a semi-persistent scheduling mode; if the scheduling informationcomprises the C-RNTI, transmitting uplink data using the schedulinginformation during a corresponding transmission interval only; and ifthe scheduling information comprises the SPS-C-RNTI, transmitting theuplink data using the scheduling information periodically according toan allocation period included in the scheduling information.
 5. Themethod of claim 4, wherein the C-RNTI and the SPS-C-RNTI are allocatedfrom the network before receiving the scheduling information.
 6. Themethod of claim 4, wherein the scheduling information is received on aphysical downlink control channel (PDCCH).
 7. A user equipment for usein a wireless communication system, the user equipment comprising: areceiver configured to: receive scheduling information from a network,wherein the scheduling information comprises either a radio networktemporary identifier (C-RNTI) to indicate that the schedulinginformation is associated with a dynamic scheduling mode or aSemi-Persistent Scheduling RNTI (SPS-C-RNTI) to indicate that thescheduling information is associated with a semi-persistent schedulingmode; receive downlink data using the scheduling information during acorresponding transmission interval only, if the scheduling informationcomprises the C-RNTI; and receive the downlink data using the schedulinginformation periodically according to an allocation period included inthe scheduling information, if the scheduling information comprises theSPS-C-RNTI; and a transmitter configured to: transmit uplink data usingthe scheduling information during a corresponding transmission intervalonly, if the scheduling information comprises the C-RNTI; and transmitthe uplink data using the scheduling information periodically accordingto an allocation period included in the scheduling information, if thescheduling information comprises the SPS-C-RNTI.
 8. A method oftransmitting data by a Node B in a wireless communication system, themethod comprising: transmitting either a first user equipment (UE)identifier for a persistent scheduling mode or a second UE identifierfor a dynamic scheduling mode to a UE on a control channel; transmittinga first data packet to the UE in accordance with the persistentscheduling mode if the first UE identifier has been transmitted to theUE on the control channel; and transmitting a second data packet to theUE in accordance with the dynamic scheduling mode if the second UEidentifier has been transmitted to the UE on the control channel.
 9. Themethod of claim 8, wherein the first UE identifier and the second UEidentifier are allocated to the UE by the Node B.
 10. The method ofclaim 8, wherein the control channel is a physical downlink controlchannel (PDCCH).
 11. The method of claim 8, wherein the first UEidentifier is a Semi-Persistent Scheduling RNTI (SPS-C-RNTI) and thesecond UE identifier is a radio network temporary identifier (C-RNTI).12. The method of claim 8, further comprising transmitting schedulinginformation for transmitting a retransmission packet of the first datapacket to the UE, the scheduling information comprising informationwhich indicates a transmit time interval (TTI) when the first datapacket was transmitted.
 13. The method of claim 8, further comprisingtransmitting scheduling information for transmitting a retransmissionpacket of the second data packet to the UE, the scheduling informationcomprising a hybrid auto repeat request (HARQ) process ID which isidentical to an HARQ process ID of the second data packet.
 14. A methodof receiving data by a Node B in a wireless communication system, themethod comprising: transmitting either a first user equipment (UE)identifier for a persistent scheduling mode or a second UE identifierfor a dynamic scheduling mode to a UE on a control channel; receiving afirst data packet from the UE in accordance with the persistentscheduling mode if the first UE identifier has been transmitted to theUE on the control channel; and receiving a second data packet from theUE in accordance with the dynamic scheduling mode if the second UEidentifier has been transmitted to the UE on the control channel. 15.The method of claim 14, wherein the first UE identifier and the secondUE identifier are allocated by the Node B.
 16. The method of claim 14,wherein the control channel is a physical downlink control channel(PDCCH).
 17. The method of claim 14, wherein the first UE identifier isa Semi-Persistent Scheduling RNTI (SPS-C-RNTI) and the second UEidentifier is a radio network temporary identifier (C-RNTI).
 18. Themethod of claim 14, further comprising transmitting schedulinginformation for transmitting a retransmission packet of the first datapacket to the UE, the scheduling information comprising informationwhich indicates a transmit time interval (TTI) when the first datapacket was transmitted.
 19. The method of claim 14, further comprisingtransmitting scheduling information for transmitting a retransmissionpacket of the second data packet to the UE, the scheduling informationcomprising a hybrid auto repeat request (HARQ) process ID which isidentical to an HARQ process ID of the second data packet.
 20. A Node Bfor transmitting data in a wireless communication system, the Node Bconfigured to: transmit either a first user equipment (UE) identifierfor a persistent scheduling mode or a second UE identifier for a dynamicscheduling mode to a UE on a control channel; transmit a first datapacket to the UE in accordance with the persistent scheduling mode ifthe first UE identifier has been transmitted to the UE on the controlchannel; and transmit a second data packet to the UE in accordance withthe dynamic scheduling mode if the second UE identifier has beentransmitted to the UE on the control channel.
 21. The Node B of claim20, wherein the control channel is a physical downlink control channel(PDCCH).
 22. The Node B of claim 20, wherein the first UE identifier isa Semi-Persistent Scheduling RNTI (SPS-C-RNTI) and the second UEidentifier is a radio network temporary identifier (C-RNTI).
 23. A NodeB for receiving data in a wireless communication system, the Node Bconfigured to: transmit either a first user equipment (UE) identifierfor a persistent scheduling mode or a second UE identifier for a dynamicscheduling mode to a UE on a control channel; receive a first datapacket from the UE in accordance with the persistent scheduling mode ifthe first UE identifier has been transmitted to the UE on the controlchannel; and receive a second data packet from the UE in accordance withthe dynamic scheduling mode if the second UE identifier has beentransmitted to the UE on the control channel.
 24. The Node B of claim23, wherein the control channel is a physical downlink control channel(PDCCH).
 25. The Node B of claim 23, wherein the first UE identifier isa Semi-Persistent Scheduling RNTI (SPS-C-RNTI) and the second UEidentifier is a radio network temporary identifier (C-RNTI).